Piston-valve for liquid-measuring apparatus.



C. F. BROWN. PISTON VALVE FOR LIQU'ID MEASURING APPARATUS.

APPLICATION FILED FEB. 19, I915.

L lgfifign Patented Nov. 30, 1915.

TTED. gTATS PATENT @FFIGE.

CHARLES F. BROWN, OF NEW YORK, N. Y., ASSIGNOR 'I'O UNIVERSAL LIQUID REGISTER COMPANY, OF NEW YORK, N. Y., A CORIEORA'IION OF NEW YORK.

PISTON-VALVE FOR LIQUID-MEASURING APPARATUS.

Specification of Letters Patent.

Patented Nov. so, i915.

Application filed February 19, 1915. Serial No. 9,340.

To all whom it may concern:

Be it known that I, CHARLES F. BROWN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Piston- Valves for Liquid-Measurin Apparatus; and I hereby declare that the ollowing is a full, clear, and exact description thereof, reference bein had to the accompanying drawings, whic form part of this specification.

This invention is 'a novel improvement in the pistons of liquid measuring apparatus of the ,type shown in my app ication for patent Serial No. 807,911, filed December 20, 1913; such apparatus comprising essentially a preferably cylindrical vessel and means whereby liquid can be admitted into either end of the vessel as it is being withdrawn from the other, direct communlcation within the vessel between the opposite ends thereof being cut off by means of a piston which moves back and forth in the vessel according to the flow of fluid therein.

The present invention has especial relation to such pistons, and its object is to construct such pistons so that they will effectually prevent communication between the interior portions of the vessel at opposite sides of the piston and prevent leakage of fluid therepast, and will also close the out let ports in the ends of the vessel when they reach the ends of the vessel.

I will describe the invention in connection with the accompanying drawings in Which- Figure 1 represents a diagrammatical sectional elevation of a measurin apparatus with my novel piston therein. Tig. 2 is an enlarged sectional view of the piston detached. Fig. 3 is an end view of the piston.

The measurin apparatus comprises a preferably cylind rical vessel 1, closed at its ends by heads 1 and 1*; head 1 being provided with a central port 1, and head 1 with a central port 1 to which ports are connected pipes 2*, 2 which are respectively connected at their outer ends to ports 2, 2 of a four-way valve casing 2 which is .also provided with aport'2 communicating with a supply pipe 4; and with a port 2 communicating with a pipe 6 connected to'a dispensin faucet 6 which can be operated manua ly by a handle 6'.

stem 2 to which is connected a handle which the valve can be manually operated. The valve 2* has two transverse ports 2 2* which are so formed that when the valve is in one position port 2 will establish communication between the ports 2 and 2 and simultaneously port 2 will establish communication between the ports 2 and 2 (as illustrated in full lines in Fig. 1.) By turning the valve to the position indicated in dotted lines in Fig. 1, port 2 will establish communication between the ports 2 and .2; and port 2 will establish communication between the ports 2 and 2 The pipe 1 communicates with a supply valve 45* which preferably has two inlet ports connected by pipes 4', 4 to two containers K, K; and by properly shifting valve 4* communication can be established alternately between the pipe 4 and either container K or K.

The vessel 1 is made of such size that it will contain a predetermined quantity of liquid, say one pint or one quart, and the introduction of such a quantity of liquid into the cylinder will force the piston to one end thereof.

The parts thus far described are similar to those shown and described in my aforesaid application.

Within the vessel 1 is a novel piston which is movable longitudinally of the cylinder and is adapted to be moved by the liquid admitted into the cylinder as hereinafter explained. This piston forms the sub ect-mat- In the valve casing 2 is a valve 2* havingja Y I ter of the present invention and is constructed as follows :An annular body 7 preferably made of hard rubber and slightly less in external diameter than the interior of the vessel 1, is interposed between oppositely facing cup leathers or washers '7 whose peripheral flanges are adapted to fit closely against the circular inner wall of the vessel 1. The body and cup washers are strung upon an axial member 8, which is preferably tubular and is exteriorly threaded on its outer ends for engagement of nuts 8 which clamp the cup leathers firmly against the body; flat ring washers 7 are preferably strung on the axial member 8- between the nuts 8 and thewashers. Detachably attachedto the ends of the axial member 3 are cushions 8, preferably formed of rubber or other suitable yieldable or resilient material. These cushions 8 may be spaced apart by a '1 of the vessel.

The operation of the apparatus is as follows: If the valve 2 is in the position shown in Fig. 1, and the faucet 6 be opened; liquid will flow from the container K through pipe 4:", valve 4:, pipe 4, port 2 pipe 2 and port 1 into the vessel 1, and the liquid will force the piston 7 in said vessel toward the head 1 thereof; and at the same time the liquid contained in the vessel'between the piston 7 and head l will be discharged through the port 1 pipe 2", port 2*, pipe 6, and faucet 6. When the piston 7 moves against the head 1 (as indicated in dotted lines in Fig.

1) its cushion 8 closes the port 1 and no more liquid escapes through the faucet; and no more liquid can enter the measuring vessel 1 through port 1. When no more liquid escapes through the pipe 6, valve 2 may be shifted so as to establish communication between pipes 4 and'2 and between pipes 2 and 6 (as indicated in dotted lines in Fig. 1,) and then if the faucet 6 be opened, liquid will flow from the supply through pipes 4 and 2* into the vessel 1 through port 1 and force piston 7 to the left; and liquid will be discharged through the port 1 and pipes 2 and 6 until the piston reaches the head 1 of the vessel, and port 1 is closed by the adjacent cushion 8} on the piston 7; then no more liquid will escape through pipe 6, until the valve 2* is again shifted to the position shown in full lines in Fig. 1. By shifting the valve 2 communication is established alternately between the supply and the opposite ends of the vessel 1, and between the opposite ends of said vessel and the faucet; but at no time can direct communication be established between the supply and the faucet.

It will be seen that when pressure is brought to bear against the cup leathers from either end of the vessel it presses the lips or flanges of such cup leathers outward against the walls of the vessel, and the harder the pressure the more certainly will the piston eliminate the air or gas in the vessel, and prevent passage of gas or liquid past the piston from one end of the vessel to the other}? My piston overcomes the difficulties which have been experienced with the pistons=formerly used in such vessels, owing to the fact that the drawn tubing (from which the vessel is ordinarily made) will always vary somewhat in diameter owing to uneven contraction in cooling ofl. But by the use of my piston an even measure is always delivered from each end of the vessel. The flanged nuts 8 hold the cushions 8 truly against the ends of the filler block 8 in the axial member 8, thus insuring that the cushions will perfectly seal the orts in the ends of the cylinder. When the ller 8 is loosely fitted in the member 8 it permits pressure to be transmitted directly through the filler from one cushion to the other.

The cup leathers preferably have lips of about one-half inch in length and will last for years without replacing same, as they will wear principally from the ends, whereas a flat washer placed around the circumference of a piston head will wear off and become smaller by the constant friction and will require frequent replacing.

What I claim is:

1. A piston comprising a tubular axial member, an annular body strung on said member, oppositely facing cup leathers on said axial member at opposite sides of the body member, and resilient cushions detach ably attached to opposite ends of the axial member.

2. A piston comprising a tubular axial member having threaded ends, an annular body strungon said axial member, oppositely facing cup leathers on said axial member at opposite sides of the body, resilient cushions at' opposite ends of the axial member, flanged nuts screwed on the ends of the body member and holding said cushions in position, and a filler in the tubular axial member interposed between said cushions.

3. A piston for the purpose specified, comprising an axial member, a body member on said axial member, oppositely facing cup leathers strung on said axial member at opposite sides of thebody member, means on the axial member for clamping the cup leathers to the body member, cushion members at the opposite ends of the axial member, and annular flanged nuts screwed on the ends of the axial'member and holding said cushion members in position, substantially as described.

In testimony that I claim the foregoing as my own, I affix mysignature in presence of two witnesses.

PATK. CONNOLLY, GUSTAVE VAN BOWBRAEBEN. 

